OER Parts offers a wide selection of Cooling System Components for your 1968 Plymouth Road Runner. OER Parts offers 1968 Plymouth Road Runner Radiator Hardware, 1968 Plymouth Road Runner Radiator Caps, 1968 Plymouth Road Runner OE Radiator Caps, 1968 Plymouth Road Runner Thermocap, 1968 Plymouth Road Runner Non Vented Radiator Caps, 1968 Plymouth Road Runner Vented Radiator Caps, 1968 Plymouth Road Runner Lever Type Radiator Cap, and 1968 Plymouth Road Runner Billet Aluminum Radiator Cap.